<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        body{
            margin:0;
            padding:0;
        }
        #item{
            width: 100px;
            height: 100px;
            background-color: red;
            border: 2px solid black;
        }
    </style>
</head>
<body>
    <div id="item"></div>
    <script src="js/ev.js"></script>
</body>
</html>